Re: ATM An efficint algorithm for robotic Foucault testing

[Dale Eason <atmpob@yahoo.com>]

I don't believe that you can because of the geometry
of the knife and mirror.  The knife is cutting into
light from horizontally opposed zones and not others. 
The setup is no different than the standard Foucault
setup and you can't determine astigmatism using only
one diameter with it.

--- Hugues.Laroche@ses-astra.com wrote:
> 
> Also one thing you did not mention: with that you
> can analise the mirror
> not only along the horizontal diameter, but others
> as well. Then you
> may quantify astigmatism, and have to test other
> positions of the mirror
> to separate the flexure part from the eventual
> "intrinsic" part.
> 


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